diff --git a/lib/tun2/server.go b/lib/tun2/server.go
index 8786285..58b5601 100644
--- a/lib/tun2/server.go
+++ b/lib/tun2/server.go
@@ -72,6 +72,10 @@ func NewServer(cfg *ServerConfig) (*Server, error) {
 }
 
 func (s *Server) ListenAndServe() error {
+	ln.Log(ln.F{
+		"action": "listen_and_serve_called",
+	})
+
 	if s.cfg.TCPAddr != "" {
 		go func() {
 			l, err := tls.Listen("tcp", s.cfg.TCPAddr, s.cfg.TLSConfig)